1 - A Promise Written By the Stars -

One promise is what allowed Acnologia to keep his humanity and sanity, for the most part, intact.

The vow? To look after five dragonslayer children sent into the future, originally part of a plan to counteract Acnologia if he turned into a true monster, the same monster which brought despair to Alakatasia.

But who knew this promise would lead him to look after children other than those five dragonslayers over the years? Acnologia has faced and felled many beasts, but nothing could prepare him for the trials and tribulations of guardianship (though some would call it parenthood).